add ewt temperatur as command type
add "EWT" reable values (ewt_temperatur, ewt_temperatur_high,
ewt_temperatur_low and ewt_speed)
back button in greent does not work properly after the second usage.
#1183
fix isRaining
fix for duplicate key exceptions
Merge pull request #1314 from HolgerHees/master

Various Fixes (S300t, ComfiAir, GreenT)